Undigested Milk In Baby Stool: Improve Your Baby’s Digestion

undigested milk in baby stool

Babies are very fragile, and something small can be an indication of a much bigger problem. One of the best ways of figuring out whether your baby is healthy or not is by looking at the baby’s poop. A lot of the time, mothers notice undigested milk fat in their baby’s poop, but you should know that this is completely normal. There are several reasons why a baby’s stool could have undigested milk and many ways by which you can improve this condition.

Even if it seems unusual, it’s quite natural. It may be undigested food when a baby eats solid food. Breastfed babies can have white chunks in their normal poop. This could also be milk fat that your baby’s digestive tract was unable to process. Undigested milk fat, both in formula-fed babies and breastfed babies often makes up white curds. Many formula-fed babies are unable to handle the protein in cow’s milk. It is also very common that the milk remains undigested since babies don’t chew their food up properly.

Is Undigested Milk in Poop Normal?

Yes, it is perfectly normal. Because milk fat doesn’t always digest completely in your baby’s stomach, their stools may occasionally have white chunks. Due to the high-fat content of breast milk, this occurs more frequently in a breastfed baby. 

Even though formula contains less milk fat compared to breast milk or cow’s milk, undigested milk can nonetheless occur in newborns who are fed formula on occasion. Undigested fat may be to blame if a baby drinks breast milk, generally passes normal feces, which is usually brown poop or mustard yellow color, and doesn’t exhibit any symptoms of discomfort or sickness.

When Should I Worry About My Baby’s Poop?

The color of your baby’s poop might provide information about their health. Ranges of poop color will be seen in your child, especially in their first year of life as their diet changes. Stools of certain colors may indicate a health problem. Always consult your doctor if your baby’s poop is: 

Red: Your baby’s doctor must examine the potential causes of any redness in your baby’s poop since it might be caused by blood. But keep in mind that there are several natural causes of red poop. A pediatrician should be seen if your infant has red feces since it might also indicate that there is blood in their bowel movements due to an intestinal infection or another problem. In certain cases, dark-colored solid foods and beverages, such as ketchup or beets, can also cause their poop to become red. A milk allergy or an anal fissure can result in red blood in a baby’s stool as well. Additionally. red poop can be brought on by some red-colored medicines like amoxicillin or cefdinir. If they have recently eaten red solid food, you should wait and see whether the next stool returns to its normal color before contacting your physician. But don’t hold off on visiting the doctor if your child exhibits other symptoms like nausea or ache in the stomach.

Black: Blood coming from the belly or gut may occasionally be the source of a black stool, but other foods, including blueberries, may also be at fault. Keep in mind that a newborn’s first stool is probably going to be dark and tar-like in color. It has mucus, skin cells, amniotic fluid, and is referred to as meconium. Black stools shouldn’t persist for more than a few days, though. It’s necessary to be aware that really dark green poop occasionally appears black. Even a dark hue of green stool is often nothing to be concerned about. Most babies who’ve been starting green-colored solid foods, such as spinach and peas, have dark green feces. Additionally, taking iron supplements may color your baby’s poop green.

Pale or white: Even though very pale or white stools are exceptionally rare, if you see your baby’s poop in this color in their dirty diaper, call your doctor right away, as it could be caused by a liver disease that has to be treated. White stool may be a sign that your baby’s liver isn’t creating enough bile for the baby’s digestive system. Gray-colored baby feces, like white poop, may indicate that your infant isn’t properly digesting food. If your toddler’s poop is grey or has a powdery consistency, get immediate medical attention.

Undigested Food Becomes a Problem at What Age?

The baby’s body is not completely coordinated when it is empty. Often, it takes many months for the stomach’s natural squeezing pattern to become rhythmic. Milk may remain in the stomach longer than usual before coming back up until that time. This is known as reflux. As soon as the kid is between 4 and 12 months old, the majority of reflux problems go away.

The majority of digestive issues in kids are trivial and improve shortly. However, there could be issues. Here are five common reasons to call a doctor.


There are many different reasons why kids vomit. They can have a viral infection, motion sickness, food poisoning, fever, allergic reaction, excessive coughing, eat excessively, or could be experiencing excessive excitement, nervousness, or worry. Vomiting could be a sign of serious illnesses, including meningitis, appendicitis, and intestinal blockage. Children may experience diarrhea, stomach aches, or fever in addition to vomiting.

Abdominal Discomfort

Children’s abdominal discomfort may indicate a variety of health issues, such as the following:

  • Constipation
  • Diarrhea
  • Foodborne illness
  • Stomach flu (gastroenteritis).
  • Gastritis (infection of the stomach lining)
  • Excessive eating

Abdominal pain that can be followed by bloating, cramps, nausea, or overall discomfort and can result from a wide variety of medical conditions.

Below are a few less common reasons for abdominal discomfort:

  • Food allergies
  • Milk allergy
  • Rheumatoid bowel syndrome
  • Intestinal blockage 
  • Appendicitis
  • Pneumonia

Both Diarrhea and Constipation

Kids may have constipation for a variety of reasons, including stress from potty training, a low-fiber diet, a lack of fluids or activity, irritable bowel syndrome, unsanitary bowel habits, hyperglycemia, or medicines. Constipation signs and symptoms include the following:

  • Stomach pain
  • Intestinal cramping
  • Painful bowel motions 
  • Fewer bowel motions than usual

How Can I Improve My Baby’s Digestion

Nurse Frequently

There are thousands of types of bacteria in our gut flora. The development of gut flora is crucial for your baby’s long-term health and wellness, and infancy is a critical period for this development. Breastmilk, which is often the best source of nourishment for babies, contains prebiotics by nature. Prebiotics in breast milk can help your baby’s gut flora by promoting the growth of beneficial bacteria while inhibiting the growth of potentially dangerous bacteria, which improves your baby’s developing digestive system. If you are unable to breastfeed or prefer not to do so, speak with a healthcare professional for guidance on your baby’s best options.

Promote a Healthy Diet

A baby can eat solid foods from approximately six months of age (but not earlier than four months) in addition to their regular milk. The food your little one consumes affects their digestive system, so make sure every bite is packed with the correct nutrients. Adding diversity over time with fruits, veggies, whole grains, certain lean meats, and fish is a smart idea. Sugary and fried foods should be consumed in moderation. Since babies are more likely to try new foods if they witness you and your family eating them, displaying healthy eating for them is the best method to get them to do so.

Consider Prebiotic Meals to Improve Digestion

Prebiotic foods should be a portion of your baby’s healthy diet since they help the beneficial bacteria in the gut grow and flourish and may also enhance the overall health of the gut flora. You can introduce common foods like:

  • Bananas
  • Apples
  • Nectarines
  • frozen peas
  • Dates
  • Couscous
  • Oatmeal muffins
  • Rye bread
  • Chickpeas
  • Lentils

Provide Frequent, Small Meals

Your baby’s stomach is significantly smaller than yours. So remember to give your small infant meals frequently to prevent an upset stomach. As your child’s stomach develops and grows, so will the amount of food and the intervals between meals.

Drinking More Liquids

Keep in mind to often give your infant fluids. Constipation, which can be a typical occurrence as your infant matures and grows into a toddler, can be avoided by drinking enough water. Offer them a good water and milk supply in addition to high-fiber bread, kiwi, and other dietary fiber-rich meals.

Make a Feeding Position Adjustment

Babies frequently spit up might benefit from a posture technique that makes use of gravity to retain the milk down. Use a more upright posture, such as the football hold, to hold your infant instead of holding him or her against your body horizontally. After a feeding, keeping the infant upright for 30 minutes could also be beneficial. If your infant is gulping and choking as your milk goes down, he could be inhaling a lot of air. Regular burping and an upright stance may assist in easing his discomfort.

Get Going

Everyone is aware of how much better they feel after working out, and your kids are no exception. For babies, massaging their stomachs or gently cycling their legs might help promote bowel movements. For toddlers, little general activity may help get things rolling, like doing yoga or dancing together. Another wonderful technique to get your child interested in exercising is to go for a stroll outside while they take in the surroundings.

Sign of Indigested Milk?

sign of indigested milk

Cow’s milk contains lactose, a form of sugar that occurs naturally in food. Stomach discomfort, bloating, gas, and watery stools are some of the symptoms of lactose intolerance, which is brought on by lactose malabsorption. For digestion, lactose is broken down in humans by the lactase enzyme. This is crucial for newborns because they require lactase to digest breast milk. A few other symptoms are:

Bloating and Stomach Pain

With lactose intolerance, bloating and stomach discomfort are prevalent symptoms. They are brought on by the colon’s bacteria fermenting lactose that the body hasn’t digested, which produces an excessive amount of gas and water. Most typically, pain is felt in the lower abdomen and around the navel.


Diarrhea or an increase in the number fluidity or volume of stools can result from lactose intolerance. When lactose that hasn’t been digested denatures in the colon, short-chain fatty acids are produced that raise the quantity of water in the digestive tract.

Additional Gas

The degree to which this occurs varies greatly from individual to individual as a result of the lactose fermentation in the colon. Lactose fermentation results in the production of odorless gas.


A less common sign of lactose intolerance is constipation. It is suggested to be brought on by a rise in colon methane production, which delays intestinal transit time.

Causes Of Undigested Food

Undigested food can occasionally be found in the baby poo as a result of health issues with the digestive system and other disorders. The doctor could refer to this as malabsorption. It may develop under the following circumstances:

  • Small intestinal bacterial overgrowth (SIBO)
  • Diverticulitis
  • Pancreas issues
  • Celiac disease.
  • Inflammatory bowel disease (IBD).
  • Cystic fibrosis
  • Lactose intolerance

How Can I Know My Baby Is Lactose Intolerance?

The signs of lactose intolerance typically appear 30 minutes to 2 hours after ingesting dairy and should disappear 48 hours afterward once the dairy has completely passed through the digestive system. Some signs might be the following:

  • Stomach ache and swelling
  • Inability to relax during feedings and inconsistent breastfeeding
  • Not gaining weight
  • Diarrhea
  • Voluminous, foamy, and frothy poop
  • Crimson bottom with patches of missing skin
  • Screaming when passing feces and blowing wind
  • Mood swings

What Does lactose Intolerance Poop Look Like?

Often, two hours after ingesting milk or some other dairy product, your child may pass loose, watery, yellow, and green-colored feces. This can indicate that the infant has lactose intolerance. It could also be an indication of other issues, though. Insufficient lactase production causes lactose to remain undigested and build up in the intestines. This might end in diarrhea. Get your child tested for lactose intolerance if diarrhea occurs after milk consumption.

Know That It Is Completely Normal

Seeing white chunks in your baby’s stools is completely normal. There are multiple reasons why this can happen, ranging from a baby’s diet changes, when a baby starts eating solids, drinking more breast milk than normal, having cow’s milk protein allergy, or suffering from certain food intolerance. 

Both breastfed and formula-fed baby poop can be affected by milk allergy and food allergies. You should contact your doctor immediately when you notice food sensitivities, as this could be a sign of other food allergies, stomach bugs, dairy allergies, or even milk allergies. It is necessary to seek medical attention immediately because food allergies can have a life-threatening reaction if left unchecked.

Stephanie Edenburgh

I'm Steph, a mom to 3 beautiful children and lover all things having to do with my family and being a mom. I've learned a lot raising my own children and working in education and healthcare roles throughout my career. Living in beautiful Southern California I enjoy documenting and writing about all of the hard work us mom's do on a daily basis.

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